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12-25-2011, 08:51 AM #1
PVC or CPVC vent pipe on tankless heater?
I need heating/plumbing experts' comments. Can you see the problem on these vent pipe materials in a new house in Canada?
When checking the page 34 of installation manual, it recommended Type-BH Class IIB (PVC) in Canada. Is it an error of CPVC?
I am not a plumber, but I think IIA is white PVC up to 65ºC(150ºF) and IIB is grey CPVC up to 90ºC(195ºF). Also I think PVC and CPVC vent pipe cannot be mixed together other than using the CPVC glue. Please correct me if wrong.
12-26-2011, 08:26 AM #2
Re: PVC or CPVC vent pipe on tankless heater?
The manual says recommended. It does not say required.
My non-expert opinion is it would be unlikely that any problems would result from the use of that grey CPVC section used for venting that WH.